slirp_kern.c revision be8ad5a409ecdbc80d4087eb76746ba15c3a92e2
1/* 2 * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 3 * Licensed under the GPL. 4 */ 5 6#include <linux/if_arp.h> 7#include "linux/init.h" 8#include <linux/netdevice.h> 9#include <linux/string.h> 10#include "net_kern.h" 11#include "net_user.h" 12#include "slirp.h" 13 14struct slirp_init { 15 struct arg_list_dummy_wrapper argw; /* XXX should be simpler... */ 16}; 17 18void slirp_init(struct net_device *dev, void *data) 19{ 20 struct uml_net_private *private; 21 struct slirp_data *spri; 22 struct slirp_init *init = data; 23 int i; 24 25 private = dev->priv; 26 spri = (struct slirp_data *) private->user; 27 28 spri->argw = init->argw; 29 spri->pid = -1; 30 spri->slave = -1; 31 spri->dev = dev; 32 33 slip_proto_init(&spri->slip); 34 35 dev->init = NULL; 36 dev->hard_header_len = 0; 37 dev->header_ops = NULL; 38 dev->addr_len = 0; 39 dev->type = ARPHRD_SLIP; 40 dev->tx_queue_len = 256; 41 dev->flags = IFF_NOARP; 42 printk("SLIRP backend - command line:"); 43 for (i = 0; spri->argw.argv[i] != NULL; i++) 44 printk(" '%s'",spri->argw.argv[i]); 45 printk("\n"); 46} 47 48static unsigned short slirp_protocol(struct sk_buff *skbuff) 49{ 50 return htons(ETH_P_IP); 51} 52 53static int slirp_read(int fd, struct sk_buff *skb, struct uml_net_private *lp) 54{ 55 return slirp_user_read(fd, skb_mac_header(skb), skb->dev->mtu, 56 (struct slirp_data *) &lp->user); 57} 58 59static int slirp_write(int fd, struct sk_buff *skb, struct uml_net_private *lp) 60{ 61 return slirp_user_write(fd, skb->data, skb->len, 62 (struct slirp_data *) &lp->user); 63} 64 65const struct net_kern_info slirp_kern_info = { 66 .init = slirp_init, 67 .protocol = slirp_protocol, 68 .read = slirp_read, 69 .write = slirp_write, 70}; 71 72static int slirp_setup(char *str, char **mac_out, void *data) 73{ 74 struct slirp_init *init = data; 75 int i=0; 76 77 *init = ((struct slirp_init) { .argw = { { "slirp", NULL } } }); 78 79 str = split_if_spec(str, mac_out, NULL); 80 81 if (str == NULL) /* no command line given after MAC addr */ 82 return 1; 83 84 do { 85 if (i >= SLIRP_MAX_ARGS - 1) { 86 printk(KERN_WARNING "slirp_setup: truncating slirp " 87 "arguments\n"); 88 break; 89 } 90 init->argw.argv[i++] = str; 91 while(*str && *str!=',') { 92 if (*str == '_') 93 *str=' '; 94 str++; 95 } 96 if (*str != ',') 97 break; 98 *str++ = '\0'; 99 } while (1); 100 101 init->argw.argv[i] = NULL; 102 return 1; 103} 104 105static struct transport slirp_transport = { 106 .list = LIST_HEAD_INIT(slirp_transport.list), 107 .name = "slirp", 108 .setup = slirp_setup, 109 .user = &slirp_user_info, 110 .kern = &slirp_kern_info, 111 .private_size = sizeof(struct slirp_data), 112 .setup_size = sizeof(struct slirp_init), 113}; 114 115static int register_slirp(void) 116{ 117 register_transport(&slirp_transport); 118 return 0; 119} 120 121late_initcall(register_slirp); 122